<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>conternier</title>
    <link rel="stylesheet" href="myflex.css">
</head>
<body>
    <div class="container">
        <div class="flex-element">
            flex-element 1
        </div>
        <div class="flex-element">
            flex-element 2
        </div>
        <div class="flex-element">
            flex-element 3
        </div>
    </div>

</body>
</html>